Office addins not being loaded

The addins do not appear in Excel, Word or Project. I can see them in the addon management part of the office apps, but they are disabled. Enabling them and restarting the application just disables them again.

Found the problem. The version of VSTO hosted on the Inflectra websits is not the most current. Uninstalled that one and installed the latest version from the Microsoft website. All the add-ins now work.